1) I subscribe to one of my IMAP folders. 2) I remove this IMAP folder on my server. 3) I get this error "Mailbox does not exist". Because it obviously does not exist anymore. 4) I right click the folder and chose 'delete'. Same error: [NONEXISTENT] Mailbox does not exist" This is probably because removing a folder also sends a command to the IMAP server to remove the folder there as well. This is kind of annoying. Now I have to recreate this subscription, unsubscribe in Thunderbird before I can remove this subscription on my server. And no, directy removing this folder in Thunderbird (instead of on my server) is not an option as I do other actions on my server as well. Is this a bug or is this as intended?